高速重载下发动机曲轴失效分析与响应面优化设计. (Chinese)

Failure Analysis and Response Surface Optimization Design of Engine Crankshaft under High Speed and Heavy Load. (English)

In the process of engine operation, the wear condition of crankshaft journal at different corners is different, which results in the reduction of the matching accuracy of crankshaft surface. Based on the stress and strain analysis of the crankshaft of the internal combustion engine, a 3D model of the crankshaft of the in-line six-cylinder was established based on the finite element method. According to the actual load of the internal combustion engine, constraints and loads were applied to the crankshaft and static simulation analysis was carried out. The results show that the maximum stress on the crankshaft occurs at the transition corner between the crankshaft journal and the crank pin, and the maximum deformation occurs in the center of the crank pin. The optimal analysis of crankshaft based on response surface method shows that: after optimization, the maximum stress and maximum deformation of the crankshaft are reduced, among which the maximum stress is reduced by 12.42% and the maximum deformation is reduced by 16.83%.To verify the feasibility of the optimization, an enterprise survey was conducted on the optimized crankshaft. Combined with the crankshaft failure rate and repair situation of the enterprise, it is concluded that the structure of the crankshaft can be effectively optimized by the response surface optimization method to improve the strength and reliability of the crankshaft. [ABSTRACT FROM AUTHOR]

发动机运行过程中, 曲轴轴颈在不同转角处磨损情况有所不同, 导致曲轴表面匹配精度降低。对内燃机曲轴进行应力应变分析, 基于有限元方法建立直列六缸内燃机曲轴三维模型, 根据内燃机实际受载情况对曲轴施加约束和载荷并进行静力学仿真分析。结果表明: 曲轴最大应力发生在曲轴连杆轴颈与曲柄销之间的过渡圆角处, 曲柄销中心出现最大形变。基于响应面法对曲轴进行优化分析, 结果表明: 优化后的曲轴最大应力与最大变形都有所减小, 其中, 最大应力减少了12.42%, 最大变形减少了16.83%。为验证优化的可行性, 对优化后的曲轴进行企业调研, 结果表明: 结构优化后的曲轴故障率和返修率都有所减小, 降低了曲轴早期出厂的故障率。 [ABSTRACT FROM AUTHOR]

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